Air-pipe damper.



W. LEO & J. C. BAYER.

AIR PIPE D AMPER. APPLICATION FILED SEPT. 8, 1909.

Patelited Sept. 27, 1910.

ry: Nomars Pennes co.. wAsmNamN. u4 c WILLIAM LEO AND JOSEPH C. BAYER,OF PORTLAND, OREGON.

AIR-PIPE DAMPER.

arnese.

Specification of Letters Patent.

Application :filed September 8, 1909.

Patented Sept. 27, 1910. Serial No. 516,760.

To all whom it may concern:

Be it known that we, 1WILLIAM Lao and JOSEPH C. BAYER, residing atPortland, in the county of Multnomah and State of Oregon, have inventeda new and Improved Air-Pipe Damper, of which the following is aspecification.

This invention relates more particularly to that type of air pipedampers that have means cooperating therewith for holding the damper toits different adjustments when set by the handle on the outside of thepipe, and it primarily has for its object to provide a damperconstruction of the character stated, of a simple and economicalcharacter by which the damper can be readily turned to the positiondesired and frictionally held locked to such position.

Our invention comprehends the improved construction and novelarrangement of parts, all of which will be hereinafter fully described,specifically pointed out in the claims and illustrated in theaccompanying drawing, in which:

Figure l is a perspective view that illustrates the general arrangementof our invention, the pipe portion being shown broken and partly insection. Fig. 2, is a section showing the damper as held frictionallylocked to its adjusted position. Fig. 3, is a partial side elevation ofthe air pipe and shows the damper as adjusted to a nearly closedposition. F ig. 4:, is a detail view of one of the bearing blocks forthe ournals of the damper, hereinafter again referred to.

In the practical arrangement' of our invention, the same embodies a mainclip plate A. preferably spear shaped as shown, perforated at thecorners, as at a., to admit of its being' readily bolted or riveted tothe damper D of the conventional form. A. designates another clip platealso formed with apertures so it can be readily bolted or riveted to theother side of the damper, said plate having a short trunnion a forengaging the bearing or reinforcing block o mounted in an opening f inthe stove pipe F and riveted or bolted thereto.

Clip plate A has a long trunnion or shaft a2 held to turn in thecombined bearing and Trunnion or shaft a2 has its outer end squared asat o3 to receive the bifurcated cam or eccentric head of the handle B,fulcrumed in such way on the pivot pin 7) as to normally hang pendentwhen the damper is adjusted to rotate freely on its end bearing Edesignates a fiat spring plate having a vertically elongated slot e soas to readily slip over the squared end of trunnion a2, the said plate Ebeing in the nature of a bowed spring plate with one end extended toform a flat bearing portion e for seating against the outside of the airpipe to which it is held by one or more bolts or rivets e2.

F rom the foregoing, taken in connection with the drawings the completeconstruction, and the manner in which our invention operates will bereadily apparent.

It will be noticed that when the handle B is pendent and in a planeparallel with the vertical axis of the pipe, the eccentric or cam headof the handle will be free from compressing spring E and hence thedamper with the handle and its clip plates .will be free to be turned toany position desired, it being' obvious that after swinging the damperto the desired position, see for example, Fig. 3, and turning suchhandle outwardly from the pipe and by bringing the cam head in positionto sufiiciently compress the spring, the damper will be held locked toits set position; and to provide for an easy adjustment of the cam oreccentric handle, one end of spring E is loosely held against theoutside of the pipe to allow it to creep as pressure is exerted on theplate.

By reason of securing the handle to the damper in the manner shown anddescribed, slack between the damper and the pipe is taken up at alltimes and the position of the damper indicated by the position of thehandle.

Having thus described our invention, what we claim and desire to secureby Letters Pat ent, is

1. As an improvement in air pipe dampers, the combination with a pipesection having a pair of diametrically opposite openings, and a combinedreinforcing block, and bearing in each of said openings, said blocksprojecting on the inside of the pipe; of the damper, a pair ofoppositely disposed clip members secured to the damper, each of whichhas a trunnion, one of said trunnions engaging the bearing at one side,the

other trunnion being extended through the other bearing or block, saidtru'nnions each having a shoulder for abutting the bearing at theirrespective sides, the extended trunnion having its outer end apertured,a flat spring plate secured at one end to the pipe and having anelongated slot through which the long trunnion passes, a lever handlecomprising a forked cam head eccentrically and pivot-ally mounted on theouter end of the extended journal, said cam head engaging said springplate adjacent to its slot7 said spring plate being held between saidlever and the adjacent part ol' the pipe section.

2. As an improvement in air pipe dampers, the combination with a pipesection with a pair of relatively large and diametrically oppositeopenings, a damper having a clip member on the opposite ends, eachhaving an outwardly extended journal adapted to he extended into andthrough the pipe openings, a combined reinforcing and abutment blockmounted on each of the said openings, and each having an aperture toreceive the journals of the damper clip7 the outer end of one of thedamper journals being squared, a handle having a bifurcated cam facedend pivotally mounted on the square section and a leaf spring secured tothe pipe section and said spring having an elongated slot through Whichthe squared end of said square ended journal is projected7 said springbeing located between said lever and the pipe section and held to beengaged by said lever, all being arranged substantially as shown andJfor the purposes described.

VILLIAM LEO. JOSEPH C. BAYER.

Vitnesses A. T. LEWis, A. H. LEWIS.

